Your thyroid needs zinc in order to function properly. Zinc helps your body produce thyroid hormones that keep it healthy. Make sure you are getting 30 to 40 milligrams of zinc in your daily diet. You can do this with a number of different foods such as spinach, chickpeas, cashews, and lean ground beef. Surprisingly enough, even natural cocoa powder contains almost three milligrams of zinc per serving. Try mixing cocoa powder into your snacks or dessert for a delicious and healthy indulgence.